A rubber cord catapult has cross-sectional area \[25\,m{{m}^{2}}\]and initial length of rubber cord is 10 cm. It is stretched to 5 cm and then released to project a missile of mass 5gm. taking\[{{Y}_{rubber}}=5\times {{10}^{8}}N/{{m}^{2}}\]. Velocity of projected missile is

• A. \[20m{{s}^{-1}}\]         
• B.        \[100m{{s}^{-1}}\]
• C. \[250m{{s}^{-1}}\]       
• D.        \[200m{{s}^{-1}}\]